Fixed spacing
diff --git a/src/objective-c/GRPCClient/GRPCCall.m b/src/objective-c/GRPCClient/GRPCCall.m
index 2c3f5c8..3d8581c 100644
--- a/src/objective-c/GRPCClient/GRPCCall.m
+++ b/src/objective-c/GRPCClient/GRPCCall.m
@@ -223,7 +223,7 @@
// TODO(jcanizales): Rename to commitHeaders.
- (void)sendHeaders:(NSDictionary *)metadata {
- [_wrappedCall startBatchWithOperations:@[[[GRPCOpSendMetadata alloc] initWithMetadata:metadata?:@{} handler:nil]]];
+ [_wrappedCall startBatchWithOperations:@[[[GRPCOpSendMetadata alloc] initWithMetadata:metadata ?: @{} handler:nil]]];
}
#pragma mark GRXWriteable implementation